79 



(27). Cornea. Cat. Assigned for study. Silvered prepar- 

 ation. Again examine the preparation of cornea already studied, 

 and in connection with the structure of the cornea (177) note the 

 cell spaces and their relation to each other. 



181. Optic nerve. Transection. vom Rath's fluid; 

 collodion ; sections //. Stain with hematoxylin and picrofuchsin. 



Note the connective tissue sheath and its relation to the schlera 

 (178), the fibers in bundles. Compare the individual fibers with 

 the fibers of the peripheral nerve given (74) ; what is the differ- 

 ence ? Can you ascertain ? Are the retinal vessels included ? 



182. Eye-lids. Transection. collo- 

 dion ; sections /*. Stain with hematoxylin and eosin. 



In this section recognize (a) the dermal and conjunctival sides 

 and the character of the epithelium of each, () the cilia (eye- 

 lashes), (c} the Meibomian gland and compare with the sebaceous 

 glands of the hair follicle (154) ; (W) the orbicularis muscle. Can 

 you find the glands of Moll ? 



183. Lachrymal Gland. . ; ; 

 . ; sections /*. Stain with hematoxylin and eosin. 



Determine the type of gland, noting the secreting acini and the 

 ducts ; and compare with the salivary glands (112, 113). 



THE NOSE. 



184. Nasal fossae, . Transection through the head 

 and nose. ; decalcified ( 131) ; collodion ; sections //. 

 Stain with hematoxylin and picrofuchsin. 



The preparation illustrates (a) the respiratory and olfactory 

 (sensory) regions in the nasal fossae of this animal and their epi- 

 thelium, () the nasal septum and the turbinal bones. 



185. Olfactory mucous membrane. Guineapig. Transec- 

 tion of a part of the more dorsal turbinal bones. Flemming's fluid ; 

 stained in toto ; paraffin ; sections /t. 



The general structure of the sensory epithelium is shown, the 

 glands of Bowman, and the olfactory fibers in the mucosa. Can you 

 distinguish the sustentacular and sensory cells in the epithelium ? 



